The invention relates to the technical field of painting equipment, and provides a feeding assembly. The feeding assembly comprises a box body with a liquid storage cavity, a discharge channel which communicates with the liquid storage cavity and an air supply mechanism, wherein the air supply mechanism comprises an airflow channel which communicates with the liquid storage cavity and an air source which communicates with the airflow channel and is used for providing air with preset air pressure; the box body is correspondingly provided with a discharge hole and a pressure relief hole; one endof the discharge channel is provided with a feed inlet which is used for extending into the liquid storage cavity below the liquid level, and the other end of the discharge channel communicates withthe outside of the box body through a discharge outlet; and the box body is provided with a switch device for opening or closing the pressure relief hole. According to the feeding assembly, when the pressure relief hole is opened by the switch device, gas or liquid in the liquid storage cavity is released to the outside of the box body through the pressure relief hole, so that the air pressure inthe liquid storage cavity is finally the same as the air pressure outside the box body, and the liquid in the liquid storage cavity is not easy to leak due to the fact that the air pressure differencebetween the inside of the liquid storage cavity and the outside of the box body is relieved.